#!/usr/bin/env python

from __future__ import print_function

import subprocess
import uuid
import re
import json
import sys
import ast
import requests
from operator import itemgetter
from heapq import nlargest


CLUSTER_UUID_NAME='cluster-uuid'
CLUSTER_OWNERSHIP_NAME='cluster-ownership'

verbose = False


try:
    from collections import Counter
except ImportError:
    from itertools import repeat, ifilter

    class Counter(dict):
        '''Dict subclass for counting hashable objects.  Sometimes called a bag
        or multiset.  Elements are stored as dictionary keys and their counts
        are stored as dictionary values.

        >>> Counter('zyzygy')
        Counter({'y': 3, 'z': 2, 'g': 1})

        '''

        def __init__(self, iterable=None, **kwds):
            '''Create a new, empty Counter object.  And if given, count elements
            from an input iterable.  Or, initialize the count from another mapping
            of elements to their counts.

            >>> c = Counter()                           # a new, empty counter
            >>> c = Counter('gallahad')                 # a new counter from an iterable
            >>> c = Counter({'a': 4, 'b': 2})           # a new counter from a mapping
            >>> c = Counter(a=4, b=2)                   # a new counter from keyword args

            '''
            self.update(iterable, **kwds)

        def __missing__(self, key):
            return 0

        def most_common(self, n=None):
            '''List the n most common elements and their counts from the most
            common to the least.  If n is None, then list all element counts.

            >>> Counter('abracadabra').most_common(3)
            [('a', 5), ('r', 2), ('b', 2)]

            '''
            if n is None:
                return sorted(self.iteritems(), key=itemgetter(1), reverse=True)
            return nlargest(n, self.iteritems(), key=itemgetter(1))

        def elements(self):
            '''Iterator over elements repeating each as many times as its count.

            >>> c = Counter('ABCABC')
            >>> sorted(c.elements())
            ['A', 'A', 'B', 'B', 'C', 'C']

            If an element's count has been set to zero or is a negative number,
            elements() will ignore it.

            '''
            for elem, count in self.iteritems():
                for _ in repeat(None, count):
                    yield elem

        # Override dict methods where the meaning changes for Counter objects.

        @classmethod
        def fromkeys(cls, iterable, v=None):
            raise NotImplementedError(
                'Counter.fromkeys() is undefined.  Use Counter(iterable) instead.')

        def update(self, iterable=None, **kwds):
            '''Like dict.update() but add counts instead of replacing them.

            Source can be an iterable, a dictionary, or another Counter instance.

            >>> c = Counter('which')
            >>> c.update('witch')           # add elements from another iterable
            >>> d = Counter('watch')
            >>> c.update(d)                 # add elements from another counter
            >>> c['h']                      # four 'h' in which, witch, and watch
            4

            '''
            if iterable is not None:
                if hasattr(iterable, 'iteritems'):
                    if self:
                        self_get = self.get
                        for elem, count in iterable.iteritems():
                            self[elem] = self_get(elem, 0) + count
                    else:
                        dict.update(self, iterable) # fast path when counter is empty
                else:
                    self_get = self.get
                    for elem in iterable:
                        self[elem] = self_get(elem, 0) + 1
            if kwds:
                self.update(kwds)

        def copy(self):
            'Like dict.copy() but returns a Counter instance instead of a dict.'
            return Counter(self)

        def __delitem__(self, elem):
            'Like dict.__delitem__() but does not raise KeyError for missing values.'
            if elem in self:
                dict.__delitem__(self, elem)

        def __repr__(self):
            if not self:
                return '%s()' % self.__class__.__name__
            items = ', '.join(map('%r: %r'.__mod__, self.most_common()))
            return '%s({%s})' % (self.__class__.__name__, items)

        # Multiset-style mathematical operations discussed in:
        #       Knuth TAOCP Volume II section 4.6.3 exercise 19
        #       and at http://en.wikipedia.org/wiki/Multiset
        #
        # Outputs guaranteed to only include positive counts.
        #
        # To strip negative and zero counts, add-in an empty counter:
        #       c += Counter()

        def __add__(self, other):
            '''Add counts from two counters.

            >>> Counter('abbb') + Counter('bcc')
            Counter({'b': 4, 'c': 2, 'a': 1})


            '''
            if not isinstance(other, Counter):
                return NotImplemented
            result = Counter()
            for elem in set(self) | set(other):
                newcount = self[elem] + other[elem]
                if newcount > 0:
                    result[elem] = newcount
            return result

        def __sub__(self, other):
            ''' Subtract count, but keep only results with positive counts.

            >>> Counter('abbbc') - Counter('bccd')
            Counter({'b': 2, 'a': 1})

            '''
            if not isinstance(other, Counter):
                return NotImplemented
            result = Counter()
            for elem in set(self) | set(other):
                newcount = self[elem] - other[elem]
                if newcount > 0:
                    result[elem] = newcount
            return result

        def __or__(self, other):
            '''Union is the maximum of value in either of the input counters.

            >>> Counter('abbb') | Counter('bcc')
            Counter({'b': 3, 'c': 2, 'a': 1})

            '''
            if not isinstance(other, Counter):
                return NotImplemented
            _max = max
            result = Counter()
            for elem in set(self) | set(other):
                newcount = _max(self[elem], other[elem])
                if newcount > 0:
                    result[elem] = newcount
            return result

        def __and__(self, other):
            ''' Intersection is the minimum of corresponding counts.

            >>> Counter('abbb') & Counter('bcc')
            Counter({'b': 1})

            '''
            if not isinstance(other, Counter):
                return NotImplemented
            _min = min
            result = Counter()
            if len(self) < len(other):
                self, other = other, self
            for elem in ifilter(self.__contains__, other):
                newcount = _min(self[elem], other[elem])
                if newcount > 0:
                    result[elem] = newcount
            return result


def print_stderr(*args, **kwargs):
  kwargs.setdefault('file', sys.stderr)
  print(*args, **kwargs)

def run_command(cmd):
  if verbose:
    print_stderr("run_command: " + str(cmd))
  child = subprocess.Popen(cmd, stdout=subprocess.PIPE,
                       stderr=subprocess.PIPE)
  (o, e) = child.communicate()
  o = o.decode('utf-8', 'ignore')
  e = e.decode('utf-8', 'ignore')
  return (child.returncode, o, e)


def get_uuid():
  (rc,uid,e) = run_command(['ceph', 'config-key', 'get', CLUSTER_UUID_NAME])
  if rc:
    #uuid is not yet set.
    uid = str(uuid.uuid4())
    (rc, o, e) = run_command(['ceph', 'config-key', 'set',
                             CLUSTER_UUID_NAME, uid])
    if rc:
      raise RuntimeError("\'ceph config-key set\' failed -" + e)

  return uid

def bytes_pretty_to_raw(byte_count, byte_scale):
  if byte_scale == 'kB':
    return byte_count >> 10
  if byte_scale == 'MB':
    return byte_count >> 20
  if byte_scale == 'GB':
    return byte_count >> 30
  if byte_scale == 'TB':
    return byte_count >> 40
  if byte_scale == 'PB':
    return byte_count >> 50
  if byte_scale == 'EB':
    return byte_count >> 60

  return byte_count

def get_nums():
  (rc, o, e) = run_command(['ceph', '-s', '-f', 'json'])
  if rc:
    raise RuntimeError("\'ceph -s\' failed - " + e)

  oj = json.loads(o)
  num_mons = len(oj['monmap']['mons'])
  num_osds = int(oj['osdmap']['osdmap']['num_in_osds'])
  try:
    num_mdss = oj['fsmap']['in']
  except KeyError:
    num_mdss = 0

  pgmap = oj['pgmap']
  num_pgs = pgmap['num_pgs']
  num_data_bytes = pgmap['data_bytes']
  num_bytes_total = pgmap['bytes_total']

  (rc, o, e) = run_command(['ceph', 'pg', 'dump', 'pools', '-f', 'json-pretty'])
  if rc:
    raise RuntimeError("\'ceph pg dump pools\' failed - " + e)

  pools = json.loads(o)
  num_pools = len(pools)
  num_objs = 0
  for p in pools:
    num_objs += p['stat_sum']['num_objects']

  nums = {'num_mons':num_mons,
          'num_osds':num_osds,
          'num_mdss':num_mdss,
          'num_pgs':num_pgs,
          'num_data_bytes':num_data_bytes,
          'num_bytes_total':num_bytes_total,
          'num_pools':num_pools,
          'num_objects':num_objs}
  return nums

def get_crush_types():
  (rc, o, e) = run_command(['ceph', 'osd', 'crush', 'dump'])
  if rc:
    raise RuntimeError("\'ceph osd crush dump\' failed - " + e)

  crush_dump = json.loads(o)
  if crush_dump['types'] is None:
    raise RuntimeError("\'types\' item missing in \'ceph osd crush dump\'")

  crush_types = {}
  for t in crush_dump['types']:
    crush_types[t['type_id']] = t['name']

  types_list = []
  for bucket in crush_dump['buckets']:
    types_list.append(bucket['type_id'])

  crush_map = []
  types_counter = Counter(types_list)
  append = lambda t,c: crush_map.append({'type':t, 'count':c})
  for id,count in types_counter.items():
      append(crush_types[id],
             count)

  if 'devices' in crush_dump:
    append('devices', len(crush_dump['devices']))

  return crush_map

def get_osd_dump_info():
  (rc, o, e) = run_command(['ceph', 'osd', 'dump', '-f', 'json'])
  if rc:
    raise RuntimeError("\'ceph osd dump\' failed - " + e)

  pool_meta = []
  oj = json.loads(o)
  proc = lambda x: {'id':x['pool'], 'type':x['type'], 'size':x['size']}
  for p in oj['pools']:
    pool_meta.append(proc(p))

  return oj['created'], pool_meta

def get_sysinfo(max_osds):
  count = 0
  osd_metadata_available = False

  os = {}
  kern_version = {}
  kern_description = {}
  distro = {}
  cpu = {}
  arch = {}
  ceph_version = {}

  incr = lambda a,k: 1 if k not in a else a[k]+1
  while count < max_osds:
    (rc, o, e) = run_command(['ceph', 'osd', 'metadata', str(count)])
    if rc == 0:
      if not osd_metadata_available:
        osd_metadata_available = True

      jmeta = json.loads(o)

      version = jmeta['ceph_version'].split()
      cv = version[2]
      if (len(version) > 3):
        cv += version[3]

      ceph_version[cv] = incr(ceph_version, cv)
      os[jmeta['os']] = incr(os, jmeta['os'])
      kern_version[jmeta['kernel_version']] = \
            incr(kern_version, jmeta['kernel_version'])
      kern_description[jmeta['kernel_description']] = \
            incr(kern_description, jmeta['kernel_description'])

      try:
        dstr = jmeta['distro'] + ' '
        dstr += jmeta['distro_version'] + ' '
        dstr += jmeta['distro_codename'] + ' ('
        dstr += jmeta['distro_description'] + ')'
        distro[dstr] = incr(distro, dstr)
      except KeyError:
        pass

      cpu[jmeta['cpu']] = incr(cpu, jmeta['cpu'])
      arch[jmeta['arch']] = incr(arch, jmeta['arch'])

    count = count + 1

  sysinfo = {}
  if not osd_metadata_available:
    print_stderr("'ceph osd metadata' is not available at all")
    return sysinfo

  def jsonify(type_count, name, type_name):
    tmp = []
    for k, v in type_count.items():
      tmp.append({type_name:k, 'count':v})
    sysinfo[name] = tmp

  jsonify(os, 'os_info', 'os')
  jsonify(kern_version, 'kernel_versions', 'version')
  jsonify(kern_description, 'kernel_types', 'type')
  jsonify(distro, 'distros', 'distro')
  jsonify(cpu, 'cpus', 'cpu')
  jsonify(arch, 'cpu_archs', 'arch')
  jsonify(ceph_version, 'ceph_versions', 'version')
  return sysinfo

def get_ownership_info():
  (rc, o, e) = run_command(['ceph', 'config-key', 'get',
                            CLUSTER_OWNERSHIP_NAME])
  if rc:
    return {}

  return ast.literal_eval(o)

def output_json():
  out = {}
  url = None

  out['uuid'] = get_uuid()
  nums = get_nums()
  num_osds = int(nums['num_osds'])
  out['components_count'] = nums
  out['crush_types'] = get_crush_types()
  out['cluster_creation_date'], out['pool_metadata'] = get_osd_dump_info()
  out['sysinfo'] = get_sysinfo(num_osds)

  owner = get_ownership_info()
  if owner is not None:
    out['ownership'] = owner
    if 'url' in owner:
      url = owner.pop('url')

  return json.dumps(out, indent=2, separators=(',', ': ')), url

def describe_usage():
  print_stderr("Usage:")
  print_stderr("======")
  print_stderr()
  print_stderr(sys.argv[0] + " [-v|--verbose] [<commands> [command-options]]")
  print_stderr()
  print_stderr("without any option, shows the data to be published and do nothing")
  print_stderr()
  print_stderr("-v|--verbose: toggle verbose output on stdout")
  print_stderr()
  print_stderr("commands:")
  print_stderr("publish - publish the brag report to the server")
  print_stderr("update-metadata <update-metadata-options> - Update")
  print_stderr("         ownership information for bragging")
  print_stderr("clear-metadata - Clear information set by update-metadata")
  print_stderr("unpublish --yes-i-am-shy - delete the brag report from the server")
  print_stderr()

  print_stderr("update-metadata options:")
  print_stderr("--name=  - Name of the cluster")
  print_stderr("--organization= - Name of the organization")
  print_stderr("--email= - Email contact address")
  print_stderr("--description= - Reporting use-case")
  print_stderr("--url= - The URL that is used to publish and unpublish")
  print_stderr()

def update_metadata():
  info = {}
  possibles = ['name', 'organization', 'email', 'description', 'url']

  #get the existing values
  info = get_ownership_info();

  for index in range(2, len(sys.argv)):
    mo = re.search("--(\S+)=(.*)", sys.argv[index])
    if not mo:
      describe_usage()
      return 22

    k = mo.group(1)
    v = mo.group(2)

    if k in possibles:
      info[k] = v
    else:
      print_stderr("Unexpect option --" + k)
      describe_usage()
      return 22

  (rc, o, e) = run_command(['ceph', 'config-key', 'put',
                            CLUSTER_OWNERSHIP_NAME, str(info)])
  return rc

def clear_metadata():
  (rc, o, e) = run_command(['ceph', 'config-key', 'del',
                            CLUSTER_OWNERSHIP_NAME])
  return rc

def publish():
  data, url = output_json()
  if url is None:
    print_stderr("Cannot publish until a URL is set using update-metadata")
    return 1

  if verbose:
    print_stderr("PUT " + str(url) + " : " + str(data))
  req = requests.put(url, data=data)
  if req.status_code != 201:
    print_stderr("Failed to publish, server responded with code " + str(req.status_code))
    print_stderr(req.text)
    return 1

  return 0

def unpublish():
  if len(sys.argv) <= 2 or sys.argv[2] != '--yes-i-am-shy':
    print_stderr("unpublish should be followed by --yes-i-am-shy")
    return 22

  fail = False
  owner = get_ownership_info()
  if owner is None:
    fail = True
  try:
    url = owner['url']
  except KeyError:
    fail = True

  if fail:
    print_stderr("URL is not updated yet")
    return 1

  uuid = get_uuid()

  params = {'uuid':uuid}
  req = requests.delete(url, params=params)
  if req.status_code != 200:
    print_stderr("Failed to unpublish, server responsed with code " + str(req.status_code))
    return 1

  return 0

def main():
  if len(sys.argv) > 1 and ( sys.argv[1] == '--verbose' or sys.argv[1] == '-v' ):
    global verbose
    verbose = True
    sys.argv.pop(1)
  if len(sys.argv) == 1:
    print(output_json()[0])
    return 0
  if sys.argv[1] == 'update-metadata':
    return update_metadata()
  elif sys.argv[1] == 'clear-metadata':
    return clear_metadata()
  elif sys.argv[1] == 'publish':
    return publish()
  elif sys.argv[1] == 'unpublish':
    return unpublish()
  else:
    describe_usage()
    return 22

if __name__ == '__main__':
  sys.exit(main())
